The patch changes the behavior of VDR to accept picture_coding_type=0
and picture_coding_type=1 as I-Frame. picture_coding_type=0 is clearly
specified as forbidden. Anything I've missed?

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No. And *as Klaus* I dunno why this should be needed except if other
parts of the logics for finding an I-frame is not robust enough for
certain streams.
What really annoys me, is rather the duplication of identical bug
reports for various DVB type (DVB-S2, DVB-T), various adapter in various
countries when playing the stream is just fine.

So the next question is whether accepting picture_coding_type=0 as
I-Frame is a proper fix. To be precise: Since VDR depends on knowledge
of I-Frames, does picture_coding_type=0 guarantee that an I-Frame is
starting? Does this hold for ALL TV streams ALL over the world, not just
yours?

As mentioned its not juts mine and that's exactly what worries me: there
are too much reports from many countries and many channels. So unless
they all use the same buggy mpeg2ts encoder, it's the sign something is
wrong and I don't think a non valid value for picture type for things
broadcasted all over the world is likely given the number of DVB
recorder but maybe I'm wrong.